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orangefs: return from orangefs_devreq_read quickly if possible
It is not necessary to take the lock and search through the request list if the list is empty. Signed-off-by: Martin Brandenburg <martin@omnibond.com> Signed-off-by: Mike Marshall <hubcap@omnibond.com>
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@ -180,6 +180,10 @@ static ssize_t orangefs_devreq_read(struct file *file,
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return -EINVAL;
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}
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/* Check for an empty list before locking. */
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if (list_empty(&orangefs_request_list))
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return -EAGAIN;
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restart:
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/* Get next op (if any) from top of list. */
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spin_lock(&orangefs_request_list_lock);
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